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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Section 1: <br /> <br />...... <br />Section II: <br /> <br />Section III: <br /> <br />TABLE OF CONTENTS <br /> <br />Introduction . . . . . <br /> <br />1 <br /> <br />The Glen Canyon Environmental <br />Studies Assessed The Impact Of <br />Dam Operations ..... <br /> <br />. . . <br /> <br />1 <br /> <br />studies Provide Basis For <br />Secretarial Decision . . . <br /> <br />5 <br /> <br />Over Thirty Studies Are Integrated <br />In This Final Report . . . . . . . . 6 <br /> <br />Motivation And Background For The <br /> <br />Studies . . . . . . . . . . . . . . 9 <br /> <br />Valued Environmental And <br />Recreational Resources Exist Below <br />Glen Canyon Dam . . . . . . . . 9 <br /> <br />Flow. In The Colorado River Through <br />Glen And Grand Canyon Is Controlled <br />By Glen Canyon Dam . . . . . . . . . 9 <br /> <br />Fluctuating Releases From The Dam <br />Caused Public Concern . . . . . . . 10 <br /> <br />Large Releases From Glen Canyon <br />Dam Are More Common Since The <br />Filling Of Lake Powell And Are A <br />Cause Of Public Concern . . .. 11 <br /> <br />Reduced River Temperature Resulting <br />From Construction Of Glen Canyon Dam <br />Diminished Habitat For Humpback Chub 12 <br /> <br />Our Understanding Of The <br />Relationships Between Dam <br />Operations And Downstream <br />Resources Is Not Complete <br /> <br />. . 12 <br /> <br />Setting And Resources Studied . 17 <br /> <br />Study Targeted Critical Resources . 17 <br /> <br />The critical Resources Are The Hump- <br />back' Chub, Common Native Fish, Rain- <br />bow Trout, Camping Beaches, Riparian <br />Vegetation And Wildlife, White-Water <br />Boating, And Trout Fishing . . . . . 17 <br />